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Bases normales d'entiers dans les extensions de Kummer de degré premier

E. J. Gómez Ayala (1994)

Journal de théorie des nombres de Bordeaux

Si F est un corps de nombres, on note 𝔒 F son anneau d’entiers ; si E / F est une extension galoisienne finie de corps de nombres de groupe de Galois G , on appelle base normale de 𝔒 E sur 𝔒 F toute base de 𝔒 E en tant que 𝔒 F -module de la forme a g g G avec a 𝔒 E . On démontre dans ce travail un critère d’existence de base normale d’entiers pour les extensions de Kummer de degré premier, qui permet une construction explicite en cas d’existence ; les principaux outils pour la démonstration sont une formule de Fröhlich pour...

Bicyclotomic polynomials and impossible intersections

David Masser, Umberto Zannier (2013)

Journal de Théorie des Nombres de Bordeaux

In a recent paper we proved that there are at most finitely many complex numbers t 0 , 1 such that the points ( 2 , 2 ( 2 - t ) ) and ( 3 , 6 ( 3 - t ) ) are both torsion on the Legendre elliptic curve defined by y 2 = x ( x - 1 ) ( x - t ) . In a sequel we gave a generalization to any two points with coordinates algebraic over the field Q ( t ) and even over C ( t ) . Here we reconsider the special case ( u , u ( u - 1 ) ( u - t ) ) and ( v , v ( v - 1 ) ( v - t ) ) with complex numbers u and v .

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